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SQL: low timer resolution hack for THD::start_time [#307]

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This commit is contained in:
Aleksey Midenkov 2017-11-22 15:24:30 +03:00
parent 3d51315912
commit 5aae304fa0
2 changed files with 35 additions and 3 deletions
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30
sql/sql_class.h
View file

@ -3323,11 +3323,37 @@ public:
inline ulong query_start_sec_part()
{ query_start_sec_part_used=1; return start_time_sec_part; }
MYSQL_TIME query_start_TIME();
void start_time_inc()
{
++start_time_sec_part;
if (start_time_sec_part == HRTIME_RESOLUTION)
{
++start_time;
start_time_sec_part= 0;
}
}
bool start_time_ge(my_time_t secs, ulong usecs)
{
return (start_time == secs && start_time_sec_part >= usecs) ||
start_time > secs;
}
inline void set_current_time()
{
my_hrtime_t hrtime= my_hrtime();
start_time= hrtime_to_my_time(hrtime);
start_time_sec_part= hrtime_sec_part(hrtime);
my_time_t secs= hrtime_to_my_time(hrtime);
ulong usecs= hrtime_sec_part(hrtime);
if (start_time_ge(secs, usecs))
{
start_time_inc();
}
else
{
start_time= secs;
start_time_sec_part= usecs;
}
#ifdef HAVE_PSI_THREAD_INTERFACE
PSI_THREAD_CALL(set_thread_start_time)(start_time);
#endif

8
sql/table.cc
View file

@ -8536,8 +8536,14 @@ void TR_table::store_data(ulonglong trx_id, ulonglong commit_id, timeval commit_
timeval start_time= {thd->start_time, thd->start_time_sec_part};
store(FLD_TRX_ID, trx_id);
store(FLD_COMMIT_ID, commit_id);
store(FLD_COMMIT_TS, commit_ts);
store(FLD_BEGIN_TS, start_time);
if (thd->start_time_ge(commit_ts.tv_sec, commit_ts.tv_usec))
{
thd->start_time_inc();
commit_ts.tv_sec= thd->start_time;
commit_ts.tv_usec= thd->start_time_sec_part;
}
store(FLD_COMMIT_TS, commit_ts);
store_iso_level(thd->tx_isolation);
}